I received the below request, just curious how I can go about doing this. I have IPs direct from ARIN and my own rdns server.
As you guys know I am a mailer, but I keep things very clean. My other provider I am currently getting Class C's from provides a private DNS. This way the public cannot view RDNS setup but the ISP's are allowed to see and verify RDNS. Do you offer this? The reason behind non-public rdns is to help a mailer like myself to keep IP space long term when using Class C's. There are blacklist organizations that scan Internet IP space looking for Class C's with a huge RDNS setup and then listing those IP blocks. By making the RDNS private you are making it so when these organizations scan there is nothing to see. However with ISP's being able to see the DNS server they are able to complete RDNS verification before accepting mail from the IPs. If you don't have this setup available that is fine I was just wondering since I am interested in larger IP space, but just need this kind of setup to be confident in keeping things long term.